Delete row ('1961', '20180') from daily_volatility

ticker_id 1961
day 20180
implied_open 0.2000187991164831
implied_high 0.2095435038363156
implied_low 0.1920815451832893
implied_close 0.2000187991164831
historical_open 0.2143058561962319
historical_high 0.2143058561962319
historical_low 0.2143058561962319
historical_close 0.2143058561962319
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